Margarites schantaricus is a species of sea snail, a marine gastropod mollusk in the family Margaritidae.

And beneath it, it is showing very slight traces of longitudinal striae, appears silvery mother-of-pearl, which shines on the whorls of many specimens while still living.

The most usual color is a dark slate-gray, through which the pearly layer, as through a heavy gauze, faintly shines.

But if one still closer follows the color changes, we find upon the pearly layer a thick yellow one, visible also from outside on the base, for it extends over the whole umbilical tract as far as the inner lip.

But usually it is covered by the slate color, which on the base through separated flames passes into the above-described yellow umbilical spot.